Final answer:
EOCs are guided by Senior-Level Advisors. The Executive Office of the President contains various significant advisory bodies, with advisors holding influential roles in presidential decisions.
Step-by-step explanation:
EOCs receive senior-level guidance from c) Senior-Level Advisors. The Executive Office of the President (EOP) includes key advisory bodies such as the National Security Council and the Office of Management and Budget, which offer senior-level advice to the President. Staff members within the EOP, like the national security advisor, serve as top advisors and typically hold significant influence over foreign policy and other presidential decisions.